Assighob ito the



' L. A. KRUPP.

EXTERNAL WRENCH HEAD.

APPLICATION FILED APR. 2|, 19:9.

, Patented Sept. 9, 1919.

U T STATES PATENT OFFICE LEO A. nurr,

or FIN LAY, bemaesmme "iroTHE BUCKEYE [mem ni ronnn COMPANY, or stunner; 01110, n conronn rron on 01110.

EXTERNAL-WRENCH HEAD.

To all whom it may concern: :1 f

Be it, known thatLLEo A, KRUPP, a citizen of the United States, and a resident of Findlay, in thelcounty of Hancock and State of Ohio, have invented a certain new and useful External-Wrench Head; and 1 I do hereby declarethe following tojbe a full,

clear, and exact description of the invention, such as will enable others skilledin the art to'which it appertains to makeand use the same, reference beinghad to themcompanying drawings, and to the characters of reference marked thereon, which form a part of this specification. a,

This invention relates particularly to wrenches of the external type for use in turning coupling collars or the like into threaded engagement with pipe ends, or-for use in gripping and imparting rotation to any othercy lindricalobject. a 3

The object of myinvention isthe provision of an apparatus of the class described which is simple, durable and efficient in its construction, easy to operate and adapted to automatically grip an article to effect a turning thereof in either direction. -Fur ther objects and advantages of the invention will be apparent from the following detaileddescription. 1 i a a While the invention, in its broader aspect, is capable of embodiment in numerous forms, acpreferred embodiment thereof is illustrated in in which,"- 1 a Figure 1 is a front elevation of a wrench head embodying the invention with parts broken away and removed; Fig; 2 isa central vertical section of the wrench head and driving connection, and Fig. 3 is a front elevation thereof with the front face plate removed.

Referring to the drawings, 1 designates the body ring of a wrench head embodying the invention, 2 and 3 the front and rear face plates of annular form secured to the respective sides of said ring and cooperating with the outerperipheral side thereof toshown as being threaded into openings in i Specificatibn r Lettersratent.

the accompanying drawings,

the face plate 2and therefrom through registering openings in the body ring and face plate 8 which areheld in position by a nut on-the outer end ofthe bolt. 1 The body ring l is provided in its inner peripheral edge ,or side with a plurality of recesses 8 which are elongated circumferentially of the ringandfhave their bottom walls disposed tangentially to a, common scribed about the ring axis, The toothed or gripping surfaces of the two jaws 10 of the shoe 9: are inclined; in opposite directions and have their teeth, directed in opposite directions so that one jaw is adapted to act to drive; annengaged member in one direction with the wrench head and the other jaw is. adapted to drive an engaged member in the opposite directionupon a turning of the head in such direction. Each shoe 9 is held within its recess for sliding movements longitudinally thereof by a screw 11, which passes? through a longitudinal center slot in the shoe and threads into the bottom of the recess. A spring-pressed detent 12 is carried by the body ring 1 for each shoe 9 and is adapted to engage a recess 13 in the shoe bottom and coact therewith to yieldingly retain the shoe in neutral position.

When the shoe is in neutral position each jaw 10 thereof has a portion of its teeth projected to a slight extent into the ring opening in position to coact with a cylindrical article which is slightly smaller than the opening and inserted therein so that upon-a turning of the head in one direction the jaw at the forward end of each shoe relative to the direction of turning of the head will engage the article and have its grip tightened thereagainst by reason of the shoe carrying the jaw sliding from neutral position toward the opposite end of its recess so as to project a greater portion of the gripping jaw from the recess, as is apparent.

9is mounted in each recess p Patentedsept, 9, 1919. Application mea a inei, 1919. aserial No, 291,620. 1 i

If the head is turned in the oppositedirection when the jaw shoes are in neutral position, the same action will take place with respect to the other'jaw ofeach shoe. By pro- .to the head through the medium of a suit- I able universal joint. This joint, in the present instance, comprises a cross-beam 16 on the end of the shaft 15 through which a pintle17 axially extends and has its ends journaled inopposite sides of "a circular yokel8, whichyoke has trunnions projecting from opposite sides thereof at right angles to the pintle 17 and j ournaled in bearing lugs 19 provided on the rear faceplate 3. The shaft'5 may be connected to any suitable power means.

I wish it understood that my invention is not limited to any specific construction, arran-gement or form of the parts as it is capable of numerous embodiments and changes without departing from thespirit of the claims. a

. Having thus described my invention, what I claim as new, and desire to secure by LettersPatent, is

Y lQ'AIl external wrench head having an article receiving opening therein and provided with an internal recess which is open to the: head opening, a "shoe mounted in the recess for sliding movements longitudinally thereof and in tangential relationto a circle concentric to the head axis, article gripping jaws carried at opposite ends ofthe shoe in exposed relation to the head opening andhaving theirgripping faces oppositely inclined, one jaw of the shoe being adapted to grip article on which the head is mounted when the head is turned in one direction and the other jaw being adapted to gri'pthe'article when the head is turned in the opposite direction, theshoe sliding to accommodate the gripping action, and means coacting with the-shoe to yieldingly hold it in neutral position.

2. In an external wrench head, a body ring, front and rear face plates attached theretoand cooperating therewith to form an external peripheral recess, a collar loosely mountedto turn in-said recess, said body ringhaving an internal recess elongated in a plane intersecting the head axis at right angles and the recess having its bottom disposed in tangential relation to a circle concentric to'the head axis with its longitudinal center substantially coincident with a radius of the head at right angles to the recess bottom, a shoe mounted in the internal recess for longitudinal movements therein and having an article gripping jaw at each end, each of which jaws is movable into article gripping position by movements of the shoe toward the opposed end of the recess, one jawof each shoe being adapted to grip an article on which the head is mounted when the head is turned in one directionand the-other jaw of each shoe being adapted to grip the article when the head is turnedin the opposite direction, and rotatable driving means connected to said head. In testimony whereof, I have hereunto signed my'name to this sp'ecification.

LEO A. KRUPP.

.G opies 'oftthispatent ma ybe obtained foi 'fivecents each, by addressing the Commissioner of Patents,

Washington, D. G. 

